Highly effective adsorption of copper ions by poly(vinyl imidazole) cryogels

Zhong, Tianyi; Feng, Xiyun; Sun, Lifen; Zhang, Jinmeng; Tian, Yiran; Zhang, Xufeng

doi:10.1007/s00289-020-03413-y

Cited by 18 publications

(8 citation statements)

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“…21−23 The characteristic bands of the imidazole ring are featured with the stretching vibration of C− N at 1227 cm −1 , C�N at 1492 cm −1 , C�C at 1648 cm −1 , and N−H at 3110 cm −1 , as well as the in-plane ring C−H bending vibration (1081 cm −1 ). 24 These observed signals demonstrate that the imidazole ring is incorporated into the sp 3 carbon backbone of PVB and PVSB. However, PVSB exhibits distinct absorption bands in the region of 700−780 cm −1 ascribed to the aromatic sp 2 C−H bending of the benzene ring, 23 which confirms the successful introduction of styrene into PVSB.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

Steering Carbon Hybridization State in Carbon-Based Metal-free Catalysts for Selective and Durable CO₂ Electroreduction

et al. 2022

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Electrocatalytic CO2 reduction using metal-free catalysts offers a promising and cost-effective approach to global carbon neutrality. However, metal-free catalysts frequently suffer from unsatisfactory catalytic performances, especially a low current density and poor stability. Herein, by modulating the orbital hybridization state of carbon, we strategically design a regulable sp3 and sp2 hybrid carbon interface embedded with adjacent boron and nitrogen sites in carbon-based metal-free catalysts for CO2 electroreduction. Soft X-ray chemical imaging visually uncovers that the electronic structure and bonding configuration of the boron active site at the hybrid carbon interface are modulated by the neighboring nitrogen site and sp3 carbon. The concomitant electron density reconfiguration around the interface not only delivers optimum upshift of the boron p-band center, and accordingly the moderate valence-electron depletion, to stabilize the *OCHO intermediate favorable for HCOOH generation but also weakens the boron–carbon and boron–hydrogen hybridization of competing *COOH and *H species, respectively, to promote HCOOH selectivity over CO and H2. The designed electrocatalyst realizes a record-high formate partial current density of up to 50.8 mA cm–2 among metal-free catalysts in the H-cell and maintains a high Faradaic efficiency (>90%) over 108 h. This work elevates the carbon interface design with a tailored carbon hybridization state for efficient CO2 electroreduction.

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Section: ■ Results and Discussionmentioning

confidence: 92%

Steering Carbon Hybridization State in Carbon-Based Metal-free Catalysts for Selective and Durable CO₂ Electroreduction

et al. 2022

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“…According to Figure 4, the characteristic stretching vibration bands of imidazole can be seen at around 1500 cm −1 (ring CH and CN), 1400 cm −1 (CN), 1110 cm −1 (ring vibration), 900 cm −1 (ring deformation). Moreover, the band at nearly1600 cm −1 is ascribed to the CC stretching vibration of the imidazole ring 38,39 . The absorption band at about 1750 cm −1 is typical for vibrations of the carbonyl group (CO) of the HEMA unit.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the band at nearly1600 cm À1 is ascribed to the C C stretching vibration of the imidazole ring. 38,39 The absorption band at about 1750 cm À1 is typical for vibrations of the carbonyl group (C O) of the HEMA unit. The asymmetrical and symmetrical stretching of methylene and methyl groups can be seen between 2800 and 3000 cm À1 .…”

Section: Ftir Analysesmentioning

confidence: 99%

Synthesis of a new adsorbent poly(allylisothiocyanate‐co‐hydroxyethylmethacrylate‐co‐vinylimidazole) via photopolymerization: Characterization and investigation of heavy metal adsorption capacity

Saltan

2022

J of Applied Polymer Sci

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We report the copolymerization synthesis of novel poly(allylisothiocyanate‐co‐hydroxyethylmethacrylate‐co‐vinylimidazole) (PAHV) adsorbents for potential applications in the heavy metal removals. In the present study, the copolymerization reaction was introduced by photopolymerization using benzophenone as the photoinitiator. The chemical structure in the PAHV adsorbents was monitored and evaluated by Fourier transform infrared spectroscopy, 1H‐nuclear magnetic resonance, andX‐ray photoelectron spectroscopy measurements. Surface analysis and molecular weight distribution of PAHV adsorbents were performed by scanning electron microscopy and gel permeation chromatography analysis, respectively. The adsorption method, which is one of the most effective techniques, was used for the elimination of heavy metal ions from aqueous solutions in this study. In order to understand the adsorption capacity and removal efficiency of heavy metal ions by PAHV, the effects of pH value and monomer ratio in the adsorbents were investigated. Inductively coupled plasma mass spectrometry device was used for these analyses. The optimum pH values for adsorption capacity and removal efficiency of heavy metal ions have been 6–8. The removal efficiency of heavy metal ions by the various PAHV adsorbents decreased in the order: Cd2+ > Pb2+ > Co3+ > Cr3+ > Ni2+ > Cu2+.

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“…The poly(VIM‐HEMA) cryogel was fabricated by free‐radical polymerization and cryogelation method according to previous work 35,46 . VIM, HEMA, and MBA were used as the functional, building‐framework, and cross‐linked monomer, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The poly(VIM-HEMA) cryogel was fabricated by freeradical polymerization and cryogelation method according to previous work. 35,46 VIM, HEMA, and MBA were used as the functional, building-framework, and cross-linked monomer, respectively. Specifically, 1.50 g VIM, 2.07 g HEMA, and 1.07 g MBA were dissolved in deionized water to prepare the precursor solution with the 10% (w/v) monomer concentration, where the molar amount of HEMA was equal to that of VIM, and MBA was 30% (w/w) of the VIM and HEMA monomers for ensuring the formation of the robust monolith.…”

Section: Preparation Of Poly(vim-hema) Cryogelsmentioning

confidence: 99%

Microfibrillated cellulose reinforced poly(vinyl imidazole) cryogels for continuous removal of heavy metals

Zhang

Zhong

Xiang

et al. 2021

J of Applied Polymer Sci

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Interconnected macro‐porous cryogels with robust mechanical structure and high adsorption capacity are desirable for the wastewater clean‐up. However, some functional alkenyl‐based monomer such as vinyl imidazole (VIM) could not be individually polymerized to form the cryogel with a robust structure for applications. Herein, a strategy has been developed to fabricate the poly(VIM) cryogel using microfibrillated cellulose (MFC) as reinforcing agent. Structural characterizations indicated that the poly(VIM)/MFC showed interconnected macropores of 12 ± 10 μm and high VIM contents. Underwater compression experiments displayed that the hysteresis loops changed slightly and the energy loss coefficients were less than 23% during loading‐unloading 200 cycles, highlighting the excellent shape recovery and fatigue resistance. Batch adsorption indicated that the adsorption capacities of the poly(VIM)/MFC cryogel to Cu(II), Pb(II), Zn(II), Cd(II), Ni(II), and Co(II) were 87.4, 53.9, 48.6, 44.3, 23.8, and 20.1 mg/g, respectively. The pseudo second‐order kinetic and Langmuir model can fit the adsorption process well, confirming the single‐layer homogeneous chemisorption. Dynamic adsorption displayed that the loaded Cu(II) ions could be rapidly adsorbed and hardly flow through the poly(VIM)/MFC cryogel, indicating the extremely fast adsorption at the flow mode. This study shows a novel strategy to fabricate the robust cryogel for environmental remediation.

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Highly effective adsorption of copper ions by poly(vinyl imidazole) cryogels

Cited by 18 publications

References 50 publications

Steering Carbon Hybridization State in Carbon-Based Metal-free Catalysts for Selective and Durable CO₂ Electroreduction

Steering Carbon Hybridization State in Carbon-Based Metal-free Catalysts for Selective and Durable CO₂ Electroreduction

Synthesis of a new adsorbent poly(allylisothiocyanate‐co‐hydroxyethylmethacrylate‐co‐vinylimidazole) via photopolymerization: Characterization and investigation of heavy metal adsorption capacity

Microfibrillated cellulose reinforced poly(vinyl imidazole) cryogels for continuous removal of heavy metals

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Highly effective adsorption of copper ions by poly(vinyl imidazole) cryogels

Cited by 18 publications

References 50 publications

Steering Carbon Hybridization State in Carbon-Based Metal-free Catalysts for Selective and Durable CO2 Electroreduction

Steering Carbon Hybridization State in Carbon-Based Metal-free Catalysts for Selective and Durable CO2 Electroreduction

Synthesis of a new adsorbent poly(allylisothiocyanate‐co‐hydroxyethylmethacrylate‐co‐vinylimidazole) via photopolymerization: Characterization and investigation of heavy metal adsorption capacity

Microfibrillated cellulose reinforced poly(vinyl imidazole) cryogels for continuous removal of heavy metals

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Steering Carbon Hybridization State in Carbon-Based Metal-free Catalysts for Selective and Durable CO₂ Electroreduction

Steering Carbon Hybridization State in Carbon-Based Metal-free Catalysts for Selective and Durable CO₂ Electroreduction